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Out-of-bounds Read Affecting nss-util package, versions <0:3.53.1-1.58.amzn1

medium

Snyk CVSS

    Attack Complexity High
    Confidentiality High
    Availability High

    Threat Intelligence

    EPSS 0.24% (62nd percentile)
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NVD
9.1 critical
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SUSE
9.1 critical
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Red Hat
7.4 high

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  • Snyk ID SNYK-AMZN201803-NSSUTIL-1726516
  • published 27 Sep 2021
  • disclosed 27 May 2021
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Introduced: 27 May 2021

CVE-2020-12403 Open this link in a new tab
CWE-125 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2018.03 nss-util to version 0:3.53.1-1.58.amzn1 or higher.
This issue was patched in ALAS-2021-1522.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nss-util package and not the nss-util package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.

A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55. When using multi-part Chacha20, it could cause out-of-bounds reads. This issue was fixed by explicitly disabling multi-part ChaCha20 (which was not functioning correctly) and strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and system availability.